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1976 chevy cheyenne 350 valve sizes?
ok, i just picked up a running driving 1976 chevy cheyenne 1/2 ton, pick up for $600. everything is beautiful on it and i plan on turning into a rat rod (body looks new but it's original) and i need to know the valve sizes used in the heads for 1976. i know that in 1971 with the passing of the clean air act, chevy started puting restrictive exhaust manifolds on and the standard was now a 2bbl carb instead of a 4bbl (this has a 2bbl). im almost positive they put smaller valves in the heads as well but im not quite sure what size. i need to be able to know if i can leave the originals on, or if i should buy new heads with bigger vlaves.
any help is appreciated, thank you.
thank you for the help guys. i already planned on putting a new 670cfm holley 4bbl carb and an edelbrock intake on (no chance of performance with the stock 2bbl)
They're 1.940 Int and 1.500 exh. The shape of the intake and exhaust port is just as critical as the size. Velocity is king. No conventional head that you can buy will out perform the factory 062 casting Vortec head for the price. NOTHING. At least not on a naturally aspirated 350 that is intended for idle to 6000 RPM use.
For the money, NOTHING will outperform and give better street manners/mileage/response than a purpose built QuadraJet Carb with a 1 inch thick Phenolic 4 hole spacer under it from Canton. They have tiny primaries to sharply enhance fuel shear when you are driving on the primaries. The better fuel shear you have, the more explosive the fuel is, easier it is to light, and the less spark advance it requires. That will decrease the BSFC. Spark advance KILLS BSFC and hence KILLS torque.
The "Camel Hump" heads with big valves will not touch the vortec head in terms of actual CFM numbers on a flow bench. And I am meaning across the entire valve lift range that I'll flow test compare them.
They're also extremely old school technology with sharp turns in the ports, etc. The Vortec heads also have a revised spark plug location. With a head like this, you can make 400 dead calm idling HP all day any day. I build about 12-15 350's with this cylinder head on them/month, and this in addition to Blown Alky, Alky sprint engines, Comp Eliminator and a few Pro Stock engines which are the daily going's on for me.
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